22 October 2014, 01:47 PM ET
Hidden cameras caught chimpanzees in Uganda raiding farmers’ crops at night, an activity possibly brought about by habitat destruction.
22 October 2014, 01:13 PM ET
This highly speculative animation is based upon analysis of a nearly complete Deinocheirus mirificus skeleton. It suggests the dinosaur may have plodded along river bottoms to forage for fish.
22 October 2014, 01:01 PM ET
A duck-billed, humpback, ostrichlike dinosaur has been unearthed in Mongolia at a site illegally excavated by poachers.
22 October 2014, 12:59 PM ET
Sex is older than anyone had ever known. New research reveals that 385 million-year-old fish did the deed — and they may have invented copulation as much as 430 million years ago.
22 October 2014, 12:40 PM ET
The first animals to have sex were tiny armored fish called microbrachius that copulated some 385 million years ago in a square-dancing type maneuver.
22 October 2014, 08:19 AM ET
During the early Permian, carnivores greatly outnumbered herbivores on land, so top predator Dimetrodon supplemented its diet by hunting sharks.
22 October 2014, 07:25 AM ET
A shrewlike creature in Madagascar that can hibernate for at least nine months of the year without waking may help reveal how mammals survived the cataclysm that ended the age of dinosaurs, researchers suggest.
22 October 2014, 07:21 AM ET
A shrewlike mammal that lives in the forests of Madagascar is a living fossil of sorts. The creature can hibernate for nine hours straight.
21 October 2014, 09:06 PM ET
Their horns are made of the same stuff as human fingernails!
21 October 2014, 03:52 PM ET
Spiders — whether you abhor them or adore them, you certainly can't ignore them. We asked our readers to send us their coolest arachnid photos, and they happily obliged.
21 October 2014, 10:51 AM ET
A tiny drone has captured stunning images of a killer whale pod, revealing which whales are pregnant and malnourished.
21 October 2014, 10:35 AM ET
A population of killer whales has been captured playing, chasing prey and socializing in gorgeous video taken by a tiny unmanned drone.
20 October 2014, 02:15 PM ET
Tiny flying drones have captured unprecedented footage of killer whales off the coast of Canada.
17 October 2014, 07:42 PM ET
Entomologist Piotr Naskrecki was taking a nighttime walk in the rainforest in Guyana, when he came across a "Goliath birdeater," possibly the world's largest spider.
17 October 2014, 07:37 PM ET
When a shark is caught for sport, it often dies from its injuries — why are sharks not protected the way other animals are?
17 October 2014, 07:09 PM ET
They have a nasty bite!
17 October 2014, 06:20 PM ET
Imagine a spider as big as a child's forearm that weighs as much as a puppy. That's how huge the South American Goliath birdeater — arguably the world's largest spider — can be.
17 October 2014, 03:25 PM ET
They have black skin under their striped hair!
17 October 2014, 07:24 AM ET
Strange vetulicolians were among the earliest animals on Earth. Now, researchers find an anatomical surprise that puts these creatures in their place on the tree of life.
17 October 2014, 03:59 AM ET
Fossils of bizarre, figure-8 shaped creatures called vetulicolians that lived during the Cambrian Period have now been discovered. And they are our cousins.
16 October 2014, 09:50 PM ET
They're the fastest animal on land and they can turn around in midair!
16 October 2014, 07:45 AM ET
Not unlike humans, male tree frogs call on females to begin the mating game, and females prefer long calls.
15 October 2014, 08:00 PM ET
Kangaroos are marsupials native to Australia. Their babies are called joeys and they live in groups called mobs.
15 October 2014, 04:15 PM ET
The ancestors of modern-day kangaroos, giant marsupials with rabbitlike faces, may have walked upright on two feet, sans any hopping, a new study finds.
15 October 2014, 02:00 PM ET
The unassuming rock goby, a small fish that can be found in rock pools around the United Kingdom, southern Europe and North Africa, is a master of camouflage, a new study finds.
14 October 2014, 06:56 PM ET
The rats that dart between trashcans and crawl across subway tracks in New York may harbor some alarming diseases, according to a new study.
14 October 2014, 11:06 AM ET
Rocks found in the deep ocean near methane vents are teeming with microscopic life, new research finds. Microbes live in (and build) these rocks, surviving on the greenhouse gas methane seeping from below the ocean floor.
10 October 2014, 07:47 AM ET
Killer whales are known for their haunting songs consisting of complex whistles and clicks, but they can also learn "dolphin speak," a new study finds.
09 October 2014, 03:10 PM ET
One snake's ability to shimmy up slippery sand dunes made it the perfect subject for a new study aimed at getting robots out of the lab and into the real world.
07 October 2014, 07:22 PM ET
The two-legged beast may have chomped on smaller dinosaurs and lizards some 200 million years ago, while living in an ancient rift valley, dotted with erupting volcanoes and once thought too inhospitable for dinosaur life.
07 October 2014, 09:10 AM ET
The scaly bearded dragon is the first reptile to show it can imitate a peer, and all for the price of a mealworm, new research suggests.
07 October 2014, 07:25 AM ET
An organization that is seeking to get chimpanzees recognized as persons — not things — under New York law is appealing a 2013 decision that denied a captive ape named Tommy a writ of habeas corpus.